My parents were not particularly religious, but we kids went to the closest little church for three or four years, until we moved to a new neighborhood far enough away that we couldn't walk to said church. That ended my religious years.
My father was raised in a 7th Day Adventist house, except not really, because they ate meat and stuff. And he hated that religion because his father was one mean SOB, and the kids blamed his intense love of Jesus, which he felt he had to yell into others. So my dad wasn't about to follow those footsteps.
I know my mother attended church as a child, but I've no idea what denomination it was. She didn't continue once leaving home.
So religion in my family was more or less casual, though they made us go to church for awhile. They ended up with three atheist sons, so they did something right. All three of us got their in different ways. We just reached the same conclusion, eventually.
Oh yea, one brother did attend church during high school, because he had a Baptist girlfriend. But since they weren't supposed to dance and she loved dancing, she didn't stay religious, and by the time they married, religion was gone from their lives.